This seems like a pretty solid build. I would look at NCIX when you are about to purchase to see if there is a free shipping offer from there. You can use price match to get the best price and customer support is great. DirectCanada and NCIX are both related too.

I'll definitely switch to that RAM instead of the one that I had originally chosen, and I'll sleep on whether or not to switch to the modular power supply. I don't think that I'm making any major mistake, but it's always very helpful to get a second opinion.

I'm located in Ottawa.

Edit: The same build at ncix costs $648.63, so I'm pretty content with the way things are looking right now, I think.

yeah, I suggested NCIX because you can get the best prices available in Canada and make them Price Match it. Up to now, all of my price match have been accepted and I have only heard of them refusing them(when it was properly done) because it was below their costs.